Academy Products manufactures a variety of custom components for use in aircraft navigation and communications systems. The controller has asked for your help in estimating fixed and variable overhead costs for Academys Rio Puerco plant. The controller tells you that the best cost driver for estimating overhead is machine-hours. Monthly data on machine-hours and overhead costs for the last year have been collected and are shown as follows. Month Machine-Hours Overhead Costs 1 660,000 $ 649,000 2 930,000 2,200,000 3 780,000 1,250,000 4 695,000 810,000 5 1,050,000 3,730,000 6 830,000 1,430,000 7 765,000 1,130,000 8 830,000 1,530,000 9 965,000 2,530,000 10 695,000 870,000 11 730,000 1,010,000 12 730,000 940,000 Required: a. Estimate the monthly fixed costs and the unit variable cost per machine-hour using the high-low estimation method. (Round variable cost per unit to 1 decimal place.) b. Draw a scattergraph relating overhead costs to the number of machine-hours.